| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | ST491AC | LOW POWER HIGH SPEED RS-485/RS422 TRANSCEIVER | 276K |
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| 2 | ST491ACD | LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER | 276K |
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| 3 | ST491ACDR | LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER | 276K |
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| 4 | ST491ACN | LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER | 276K |
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| 5 | ST491ACN | Low power high speed RS-485/RS-422 transceiver | 245K |
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